Magnetic concentrator



E. w. DAVIS MAGNETI C CONCENTRAIORJ Filed Jan. 14. 1921 2 Sheets-Sheet 1 Nw. 2a, i923 mmm E. W. DAVIS MGNETIC CONCENTRATOR Filed Jan. 14'. 1921 2 Sheets-Sheet 2 I I l [n Ven for 50m/APD WDA W5 Hz's A orneyf Patented Nov. 2o, 1923.

EDWARD W. DAVIS, 0F' MINNEAPOLIS, MINNESOTA'.

MAGNETIC CONCENTRATOR.

Application ined January i4, 1921. seriai No. 437,280.

To all. lwhom it may concern.:

Be it known that I, EDWARD W. Davis, a citizen of the United States, resident of Minneapolis, county of Hennepin, State of Minnesota, have invented certain new and useful Improvements in Magnetic Concentrators, of which the cation.

This invention relates to improvements in magnetic concentrators. Such apparatus is particularly adapted for use in making mag netic ii'on assays in connection with iron ore. It is old in this art toemploy a glass tube A connected to a source ofwater and to lhold the tube adjacent the poles of an energized eleetromag'net and thereafter to. drop the sample ofthe iron ore to be tested in the 'upper end of the tube whereupon, during descent, the non-magnetic particles of the i 4magnetically sample pass through the field and descend to the lower end of the tube, the magnetic portions being attracted and retained by the magnetic fiel It is'old, too, to permit water to pass 'through the tube to wash the attracted particles to remove any adherent non-magnetic material. During the passage of water through the tube, it is customary gently to reciprocate the tube lengthwise in the magnetic field and, coincidently, to oscillate the tube substantially on its longitudinal axis. this improved apparatus principally re sides in the mechanical means provided automatically to effect such reciprocatory and oscillatory movements. f The object of this invention, therefore, is to provide an improved magnetic. concentrating apparatus.

Other objects of the invention will more fully appear from the following description and accompanying drawings and will be pointed out in the annexed claims.

In the accompanying drawings, there hasv been disclosed a structure designed to carry 2' ,out the ob]ects of the invention, but it is to be understood that the invention is not confined to the exact features shown. as various changes may be madewithin the scope of the claims which follow.

In the drawings:

Figure 1 is a front elevation of the aparatus a )ortion thereof beine diagrama r n matic;

Figure is an enlarged detailed view in front elevation of thc mechanism for hold.-

following is :1 -specifislide and associated parts The novelty in.

.stopcock 18.

ing and moving the test tube, the core beinbroken away; z y y igure 3 is a section on the line 3--3 of Figure 2;

Figure 4 is a section on the line 11--4 of Figure 2; and

KFig-uref is a detailed view in plan of the l`he selected embodiment here disclosed of this invention is one particularly adapted4 for laboratory use in testing the magnetic iron content of a sample Vof ironvore. The apparatus consists of an elevated water tank 6 having a water inlet 'q' connected to a suitable source of supply, and an overflow outlet 8. A pipe 9 communicates with the interior of the tank (i and is adapted to draw watertherefrom. A pipe 11, carried. by and communicating with the pipe 9, is provided with an intermediatevalve 12 to control the gravity fiow of water therethrough. The pipe. 11 is terminally connectedto a flexible water supply tubing 13 which, at'its other end, is fitted over the annular shoulder 14 of the side-opening of the tube 15 which is preferably of glass in order to per- `mit view of the operation. The upper end of the tube is open and terminally flared and is adapted to be closed by means of the rubber stopper 16. The open lower end of the tube is fitted with a short piece ofrubber tubing 17 upon which is clamped a, suitable A flexible rubbertubiiig 19 is fitted to the lower open end of the pipe 9 and the lower end of this tubing is fitted with a valved outlet member 20.

The tube is adapted to be 'movablv c arried by a sleeve suitably mounted .and actuable to cause the sul'istautially niiddleportion of the tube to be moved adjacent the poles 22 of an electromagnet.. This electromagnet preferably consists of an iron core 23 bent to provide the opposed poles 22, and provided with the usual Winding 24 through which electric current may be passed upon closure of the usual circuit throii h "the switch 25. The core 23 .is supported y any suitable standards 10, asdiagrammatically illustrated in yFigure 1, which rest `upon a base indicated by the surface line 27; l

As stated, this invention particularly relatesI to the mechanical means for imparting a turning or oscillatory and a reciprocatory motion to the tube; .The word turning or oscillation and forms thereof` un y are here employed to describe the partial turning of the tube, back and forth, upon its longitudinal axis; while the word reciprocation and its forms are employed to described the up and down movement of the' tube substantially in the direction of its longitudinal axis.

A frame, having suitably braced metallic side rails 26, is preferably provided with integral rings 46 within which are received the core portions adjacent its poles 22. The

frame is thereby held by the core so that the middle portion of the tube is slidable upon the rounded pointed poles 22 of the electromagnet as indicated in Figures2 and 3. A metallic plate' 28, arcuately curved in cross-section, is fixedly secured in position betweenthe side rails by means of the legs 2 9 screwed to the rails. The concave face of this plate is outwardly presented while its sides are relatively built up to form integral stationary guides 31. The carriage, adapted to be slidably reciprocated upon these guides, comprises side-blocks 32 suitably groovedl to receive the 'stationary guides 31 in slidable engagement. A plae 83 is secured at its sides tothe two upper faces of the blocks byl means of the screws 34. This plate 33 is curved similarly to the plate 28 and is carried by the blocks 32- l plate 33. This sleeve 37 is provided with a.

pin 38 which is preferably integral therewith.v This pin is adapted to be inserted Within and to project through, the space dclined by the registry ot the superposed slots, The pin 38 carries rollers freely rcvoluble thereon. The lower roller 39 is adapted to engage the sides of the slot 36 iu the fixed plate 28 while the upper roller '-ll similarly engages the sides of the slot 35 of the slidable plate 33. Therefore. when the carriage is reciprocated` the sleeve carried thereby is not only reciprocated but is also simultaneously oscillated due to the cam action of the roller-bearing` pin 33 in following the diagonal slot 36 in the lixed plate 28 while coincidently followingthe slot. 36 in the slidable plate 33.

' The holder is made iu such form in order to receive the glass tube 15. A rubber collar l2 is preferably placed around the upper portion of the tube 15. This collar, when positioned on the tube, is adapted to be reheld in adjusted position by means of the thumb-screw 45.

A simple mode of reciprocating the carriage is aiforded by the small electric motor 47 and its associated mechanism. The motor is substantially of a spheroidal external conformation and is provided with a tightly littingmetallic strap 48 having opposed trunnions 49 pivotally mounted in brackets 5l secured by bolts 52 to one of the rails 26. The motor is held in the desired axially angular position with relation to the rails by means of adjusting screws 40 received in threaded engagementv in the bracltets and engaging the trunnions. The shaft 53 is coupled directlyto the motor shaftandis revolubly supported by the bearings 54 carried by the arms 55 and 56 projecting from one rail 26. The upper end ofthe shaft 53 is provided with a worm 57 meshin with a worm wheel 58 fast on a crank-sha t 59 revolubly borne by the bearings 60 on the side rails 26. The cran-k arms through the pin 50 carry the bearing block 62 secured to the upper end of theconnecting rod 63 which is pivotally carried at its lower end by the pin 64 (see Figure et) mounted in ears 65 opposedly de- I pending from the curved bar 66 secured by the screws 6T to the slidable blocks 32 of the carriage. The electric motor 47 is adapted to be driven from a. suitable source of current not necessary to be shown through the switch 21. Preferably a tension spring 69 is secured at one end to the side rail 26 and at its other end to the ear 70 of one block 32 of the carriage. This spring is preferably employed to counteract the weight ot the reciprocatingparts as the trame is held in au inclined or upright plosition.

The preferred manuel' ot opera( ion ot the apparatus here disclosed is as follows; The stop-cock 13 is closed aud the valve 12 is opened sutiicieutly to till the. tube nearly to its top. The switch 25 is closed andthe electromagnet energized. ple of the ore to4 be assayed, which has previously been pulver-ized to pass a screen of one hundred meshes to the square inch, is poured into the upper end of the tube and settles down through the water until it reaches the poles ot' the. electromagnet where a part ot' it stops in the magnetic field. t'ter washing out the cup or flared upper end of the tube. the stopper lt is tightly positioned iu the tube end. The valve l2 is then opened. as is also the stopcoclr .18 of the outlet tubing 19. After opening the latter, water flows, via the supply A ten grani sam-v Cit tubing 13. into the upper end of thetube and runs out the lower end thereof, carrythese twov movements is to free* the non-A magnetic portion of the ore and tov allow the down-flowing current of water *tol carry such portion into kthe evaporatingl pan.

Such movements are continued until'nov more non-magnetic material; can be washed out of theV tube. The portion remaining under attraction in the field of the electromagnet is clean magnetic concentrate and this is removed from the tube and placed in a suitable receptacle. The removal is preferably effected by stopping the motor and by demounting the tube from its holder` and slowly raising it until the magnetic material held in the field is near the bottom of the tube. The water supply is then cut ofi' at the valve 12 and therubber stopper 16 is removed from the mouth of the tube. The speed of water outlet from the tube is governed by the stop-cock 18 so that., as the level of the water in the tube reaches the level of the concentrate, the stop-cock 18 is closed and the tube is removed from between the poles of the magnet and all the tube contents are removed from the tube into a suitable lcup which may thereafter be held in the magnetic field whereby the concentrate will be retained in the cup while the water is decanted therefrom.

I claim as my invention:

1. in a magnetic concentrator, the combination of a frame, an elongated container for the material to be concentrated mounted in substantially uprightposition to reciprocate on said frame, magnetic means positioned adjacent an intermediate portion of the container to create a magnetic field only at intermediateportions of the container,

' and means to reciprocate. 'the container substantially along its upright axis in said field whereby magnetic vparticles of the material will be retained by the field` in the intermediate'portions of the container and nonmagnetic particles thereof will drop therethrough.

2. In a magnet-ic concentrator, the com-` bination of a frame, a container for the material to be concentrated mounted to have oscillatory turning movement on the frame, a magnet positioned to create a magnetic field adjacent the frame, and means oscillatorily to turn the container in said field whereby to facilitate the retention of magnetic particles the material will of the material in the field and to facilitate thedrop` of the `non-magnetic particles thereof through the field.

3. Ina magnetic concentrator, the combination of a frame, a container for the Vmaterial to be concentrated mounted on'said frame in upright position to reciprocate substantially'along its upright axis andto have an oscillatory'turning movement about-said axis; a magnet positioned to create a' magnetic field 'adjacent the frame.'and means kto reciprocate and to oscillate the container l1n said field whereby magnetic particles of in the field and the lmaterial will be retained thejnon-magnetic particles the'reof'will drop therethrough.

' 4. In a magnetic concentrator, the combination of a frame, s'lideways fixedly mounted in'spaced relation on the frame, a carriage; slidably `mounted on the slideways 'and adapted to reciprocate thereon, a container for the material to be concentrated mounted to oscillate on'the carriage, a magnetpositioned to'create a magnetic field adjacent th'eframe. and means operable simultaneously to reciprocate the carriage and to oscillate the container in said field whereby magnetic particles of the material will be retained in the field and non-magnetic particles thereof will drop therethrough. l

In a magnetic concentrator, the combination of a frame. a carriage mounted to reciprocateon said frame, a container for the material to be concentrated mounted to ously to reciprocate said carriage and to oscillate said container in said `field whereby magnetic particles ofthe material will be retained in the field and non-magnetic particles thereof will drop tlieietlirougi'li.

6. In a magnetic concentrator` nation of a frame` a plate secured to the frame, a carriage mounted to reciprocate on said plate. the plate having a slot extending diagonally to the axis of reciprocation of the carriage, and the carriage having a slot extending transversely to said axis, a container for the material. to be concentrated, a holder therefor, the holder having a pin adapted to project through both slots whereby. upon reciprocation of the carriage, the holder is caused to oscillate, a magnet positioned to create a magnetic field adjacent the frame. and means to reciprocate the carriage in said field wherebymagnetic particles of and non-magnetic particles thereof will drop therethrough. y.

7. 1n a magnetic concentrator, the combination of aiframe, an arcuatel curved plate afiixedtothe frame, a similar y curved late vreciprocally movable on -the fixed plate. the fixed plate having a slot extendthe combibe retained in thefieldv "ing diagonally to the axisvof reciprocation` of the movable Vplate and the latter having i a slot extending transversely to said a.xis,.a

container for the material to be concentrated, a sleeve to hold the container and shaped to be positioned on said movable plate, a

pinoli the sleeve to project through both.

vslots whereby, upon reciprocation of the movable plate,ithe sleeve is caused to oscil-- lute thereon, a magnet positioned tocreate a magnetic field adjacent the frame, and

means to reciprocate the movable plate in i y Said field whereby magnetioparticles of the .material will be retained 'in the field and non-magnetic particles thereof will drop therethrough, 1 y

8. In a ii'i'agnetic concentrator, the com'- binat-ion -ot Va frame, a-conta-iner mounted in upright position Ato reciprocate onvsa-id frame and adapted to permit the material to be concentrated to drop therethrough,

means to produce a magnetic field adjacent the container whereby the drop of magnetic particles ot the material is arrested, and means lto reciprocate the container substantially along its upright axis in said field` whereby the magnetic separation oi the particles of the material is facilitated.

9. In a-magnetic concentrator, the combiiiation of a fran'ie, a container 'for the material to be concentrated, a substantially cylindrical holder for thel container, a carriagemounted to reciprocate on the frame -and having an arcuate bearing portion for said holder, means to create a magnetic fieldV adjacent said container, and means operable to reciprocate the carriage and to oscillate the holder on said bearing surface whereby niagneticparticles of material will be retained in the field and non-magnetic particles thereof will drop therethrough. i A

In witness whereof, I ha've hereunto set" my hand this 7 .dai1 of January 1921. a

' EDWARDIV. DAVIS. 

